Good, but...
I was really enjoying this game until I got 10 rooms in, beat the Death Machine with ample health remaining, and the game decided that I lost anyway and made me start over. Because of that, 3/5 7/10.
This game is a lot of fun, but making the player start over from the beginning if they die is ridiculous, especially if this game decides to kill you randomly after you complete a room. Make the "retry" option allow you to start again from where you died with all of your upgrades, but a with a reset score. Fix that, and you've got top scores from me.